The Legend of Zelda: The Wind Waker - Red Bubble

Red Bubbles are flying skulls that are covered in flames that will follow Link endlessly until he gets too far away. The Boomerang does nothing against this enemy, although one hit from Link's sword or an arrow will kill it instantly. Also, using the Deku Leaf will extinguish its flames, making it open to attacks, although it will rekindle if left alone for too long.